Centennial-Scale SE Pacific Sea Surface Temperature Variability Over the Past 2,300 Years
Detailed temperature reconstructions over the past 2,000 years are important for contextualizing modern climate change. The midlatitude SE Pacific is a key region in this regard in terms of understanding the climatic linkages between the tropics and southern high latitudes. Multicentennial timescale...
Published in: | Paleoceanography and Paleoclimatology |
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Online Access: | https://doi.org/10.1029/2018PA003465 https://repositorio.uchile.cl/handle/2250/172017 |
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ftunivchile:oai:repositorio.uchile.cl:2250/172017 2023-05-15T14:01:29+02:00 Centennial-Scale SE Pacific Sea Surface Temperature Variability Over the Past 2,300 Years Collins, James A. Lamy, Frank Kaiser, Jérôme Ruggieri, Nicoletta Henkel, Susann De Pol-Holz, Ricardo Garreaud Salazar, René Arz, Helge W. 2019 application/pdf https://doi.org/10.1029/2018PA003465 https://repositorio.uchile.cl/handle/2250/172017 en eng John Wiley and Sons Inc. Paleoceanography and Paleoclimatology, Volumen 34, Issue 3, 2019, Pages 336-352 25724525 25724517 doi:10.1029/2018PA003465 https://repositorio.uchile.cl/handle/2250/172017 Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ CC-BY-NC-ND Paleoceanography and Paleoclimatology Oceanography Atmospheric Science Paleontology Artículo de revista 2019 ftunivchile https://doi.org/10.1029/2018PA003465 2022-09-24T23:50:31Z Detailed temperature reconstructions over the past 2,000 years are important for contextualizing modern climate change. The midlatitude SE Pacific is a key region in this regard in terms of understanding the climatic linkages between the tropics and southern high latitudes. Multicentennial timescale temperature variability remains, however, poorly understood, due to a lack of long, high-temporal-resolution temperature records from this region and from the southern high latitudes in general. We present a unique alkenone sea surface temperature (SST) record from 44°S on the southern Chilean margin in the SE Pacific spanning the last 2,300 years at decadal resolution. The record displays relatively large changes including a cooling transition from 14 to 12.5 °C between 1,100 and 600 cal yr BP, in line with other Chile margin SST records and coeval with Antarctic cooling. This cooling is attributable to reduced Southern Ocean deep convection, driven by a late Holocene sea-ice increase in the Weddell Sea associated with increased El-Niño Southern Oscillation variability. Superimposed on the late Holocene cooling, we observe multicentennial timescale SST variability, including relatively cool SSTs (12.5 °C) from 950 to 500 cal yr BP, corresponding to the Medieval Climate Anomaly, and warmer SSTs (13 °C) from 500 to 200 cal yr BP, corresponding to the Little Ice Age. These oscillations may reflect either multicentennial internal variability of the Southern Ocean deep convection and/or multicentennial variability in the phasing of El-Niño Southern Oscillation and Southern Annular Mode events. Article in Journal/Newspaper Antarc* Antarctic Sea ice Southern Ocean Weddell Sea Universidad de Chile: Repositorio académico Antarctic Pacific Southern Ocean Weddell Weddell Sea Paleoceanography and Paleoclimatology 34 3 336 352 |
institution |
Open Polar |
collection |
Universidad de Chile: Repositorio académico |
op_collection_id |
ftunivchile |
language |
English |
topic |
Oceanography Atmospheric Science Paleontology |
spellingShingle |
Oceanography Atmospheric Science Paleontology Collins, James A. Lamy, Frank Kaiser, Jérôme Ruggieri, Nicoletta Henkel, Susann De Pol-Holz, Ricardo Garreaud Salazar, René Arz, Helge W. Centennial-Scale SE Pacific Sea Surface Temperature Variability Over the Past 2,300 Years |
topic_facet |
Oceanography Atmospheric Science Paleontology |
description |
Detailed temperature reconstructions over the past 2,000 years are important for contextualizing modern climate change. The midlatitude SE Pacific is a key region in this regard in terms of understanding the climatic linkages between the tropics and southern high latitudes. Multicentennial timescale temperature variability remains, however, poorly understood, due to a lack of long, high-temporal-resolution temperature records from this region and from the southern high latitudes in general. We present a unique alkenone sea surface temperature (SST) record from 44°S on the southern Chilean margin in the SE Pacific spanning the last 2,300 years at decadal resolution. The record displays relatively large changes including a cooling transition from 14 to 12.5 °C between 1,100 and 600 cal yr BP, in line with other Chile margin SST records and coeval with Antarctic cooling. This cooling is attributable to reduced Southern Ocean deep convection, driven by a late Holocene sea-ice increase in the Weddell Sea associated with increased El-Niño Southern Oscillation variability. Superimposed on the late Holocene cooling, we observe multicentennial timescale SST variability, including relatively cool SSTs (12.5 °C) from 950 to 500 cal yr BP, corresponding to the Medieval Climate Anomaly, and warmer SSTs (13 °C) from 500 to 200 cal yr BP, corresponding to the Little Ice Age. These oscillations may reflect either multicentennial internal variability of the Southern Ocean deep convection and/or multicentennial variability in the phasing of El-Niño Southern Oscillation and Southern Annular Mode events. |
format |
Article in Journal/Newspaper |
author |
Collins, James A. Lamy, Frank Kaiser, Jérôme Ruggieri, Nicoletta Henkel, Susann De Pol-Holz, Ricardo Garreaud Salazar, René Arz, Helge W. |
author_facet |
Collins, James A. Lamy, Frank Kaiser, Jérôme Ruggieri, Nicoletta Henkel, Susann De Pol-Holz, Ricardo Garreaud Salazar, René Arz, Helge W. |
author_sort |
Collins, James A. |
title |
Centennial-Scale SE Pacific Sea Surface Temperature Variability Over the Past 2,300 Years |
title_short |
Centennial-Scale SE Pacific Sea Surface Temperature Variability Over the Past 2,300 Years |
title_full |
Centennial-Scale SE Pacific Sea Surface Temperature Variability Over the Past 2,300 Years |
title_fullStr |
Centennial-Scale SE Pacific Sea Surface Temperature Variability Over the Past 2,300 Years |
title_full_unstemmed |
Centennial-Scale SE Pacific Sea Surface Temperature Variability Over the Past 2,300 Years |
title_sort |
centennial-scale se pacific sea surface temperature variability over the past 2,300 years |
publisher |
John Wiley and Sons Inc. |
publishDate |
2019 |
url |
https://doi.org/10.1029/2018PA003465 https://repositorio.uchile.cl/handle/2250/172017 |
geographic |
Antarctic Pacific Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Pacific Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean Weddell Sea |
op_source |
Paleoceanography and Paleoclimatology |
op_relation |
Paleoceanography and Paleoclimatology, Volumen 34, Issue 3, 2019, Pages 336-352 25724525 25724517 doi:10.1029/2018PA003465 https://repositorio.uchile.cl/handle/2250/172017 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 Chile http://creativecommons.org/licenses/by-nc-nd/3.0/cl/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1029/2018PA003465 |
container_title |
Paleoceanography and Paleoclimatology |
container_volume |
34 |
container_issue |
3 |
container_start_page |
336 |
op_container_end_page |
352 |
_version_ |
1766271329441415168 |